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Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…
... to add a composite video port. Perhaps they have shorted the ... . You should have a kilohms reading at least. -
c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…
... /> in a,(c) ;and try reading it
inc a ;YM2149F ... things I've noticed. The port number for 128K page switching ... -
Copying a single character from one place to another?[code] ORG 33000 LD A,8 LD HL,16384 LD BC,256 LD DE, 18432 LOOP: PUSH AF LD A,(HL) LD (DE),A ADD HL, BC POP AF DEC A JR NZ,LOOP REST […
... specific address or I/O port.
Code:
... the address bus during port IO operations. This means ... compute a 16-bit port number! The spectrum itself ... because of this feature, port numbers in SPIN are always ... most common way of reading this in machine code ... -
Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…
... HAL10H8( or PAL10H8 ). This is port decoder and memory controller.
- data of paging port 7FFD are rewrited also if ... CPU read of port 7FFD (write floating bus data ... is good feature, disable reading from port 7FFD is also good, but ... -
West Bank only running with Kempston Joystick on ZX SpinI can get West Bank [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0005664"]worldofspectrum.org/infoseekid.cgi?id=0005664[/url] only to run w…
[quote="weiv;905313"]any port from 0 to 31 (A7= ... 1 to 31 (or just port 31) read Kempston joystick on ... that I was polling port 11 when reading Kempston joystick controls. It ... -
ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next
... Amiga style "strip" sprites, the reading pattern might be fixed, but ... whether the actual reading on the given line for ... )
Timex added a cartridge port to the 48k spectrum :- NOT ... -
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... port set to Kempston. However I am probably using bad joystick reading ... the seemingly unnecessary saving and reading from joyresult).
[code]kempston ... -
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... joystick reading code[/quote]
It’s fine. Any odd port ... -
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... am probably using bad joystick reading code as this is the ... enabled. As the result, the port returns the value 255, which ... further reads from the Kempston port in case it was not ... -
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... be avoided by using contended port for Kempston.
[/quote]
Reading an unattached port, the bus (except D2 ... -
Can Arkanoid be played using a Kempston joystick?It says so in the instructions but annoyingly without saying how. I load it up and no matter what button I start the game with, it won't work with a …
... the kempston interface after loading (reading $1F port) and if found then ... /> If your interface works different port or sends different data at ... -
Can Arkanoid be played using a Kempston joystick?It says so in the instructions but annoyingly without saying how. I load it up and no matter what button I start the game with, it won't work with a …
... the kempston interface after loading (reading $1F port) and if found then ... -
ZX Nuvo 128..Hi There, I have built the ZX Nuvo 128 by Superfo, but it has a problem. The machine is working, but the video signal is completely bonkers. I've …
... next batch.
About joystick port, yes I realize that but ... diodes for full data bus reading. again I will try to ... -
z88dk : Support FunctionsJust a quick one here, I am looking to doing some dirty dirty code with C and load a screen$ file from the disk using "system( command )" - yes I …
... 'll find some information on reading the catalog a bit at ... me know and I can port it over from the newlib ... -
ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…
... 0 on top of the port instead of B. I'm ... to the programmer, the people reading your code and the people ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... .co.uk/wiki/Floating_bus]reading from a certain port[/url] and lists ... 6 and 7 move the port sampling 'position' within the frame ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... be read from the fb port is not really clear to ... . The actual test, like the port reading and whatnot shouldn't be ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... active mode immediately before reading the fb port, and then quickly switching ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... #71 is read from the port #0FFD constantly, but why? I ... main screen, when ULA begins reading of value #71 from the ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... between the HALT and reading the fb port in the main test ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... value read from the fb port before 14368 is indeed #C9 ... that gives a different “false” reading of 57. Is this because ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... value read from the fb port before 14368 is indeed #C9 ... ]
It means that any reading from the contended memory, including ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... #C079 (before the main fb port reading), the IN at #C079 will ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... .
The formula for the port number is (1 + (4 * n ... $FF if bit 5 of port 32765 is set (i.e ... bit 5 is reset, the port read returns the value currently ... four T states in between reading the two pairs bitmap+attribute ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... #C079 (before the main fb port reading), the IN at #C079 will ... -
Chibi Akumas - Spectrum Port Planned!I'm planning to port my CPC game, Chibi Akumas to the ZX Spectrum! I will be targeting the 128k disk based systems - as this will be the best (and mo…
... latest info on the Spectrum port!
Episode 2 is ... ahead!
Thanks for reading!
Keith -
Games that deserved a better port/conversionRecently I was watching (again) some classic games from other machines. Thinking about how to resolve graphical decisions on the speccy (colours, des…
... 't have a very good port (with the exception to the ... ]
I vaguely remember reading somewhere that Turbo Out Run ... -
Need help from people with real 128/black +2 and grey +2A/+2B/+3.Please, if you have time and inspiration, run [url="https://www.worldofspectrum.org/forums/discussion/55518/test-of-screen-switching-timings"]this t…
... 1 and back, with choosed port and on choosed tact from ... occurs between pixels and attributes reading by ULA for output, but ... -
Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... ]does not[/i] rely on reading a byte from ROM (although ... /> in a,($fd) ;read from port $ffd
inc a ;if ... ]not[/i] be $ff (obviously). Reading from the first attribute byte ... -
The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... made to read from IO port 7FFD (or any address that ... /> Right, which is why reading from this port (these ports) is a ...
